My driver side window is fine. My passenger window goes down, and sometimes doesn’t go back up, and the only way to get it back up is to supply power directly to the motor itself with an external power source. Then the window begins to work with the switch. What could be the issue? It’s not the switch as I’ve replaced the switches.

 

New or used switches? Might wanna check the various connectors, make sure they are clean, and tight.

Does the window struggle to go up?

 

New. Yes, the window does struggle to go up when driver/passenger switches are used simultaneously. The motor itself is okay. I tested a new window motor, and it still doesn’t work, you can feel the motor trying to work (you feel a hum) but it doesn’t. The switches were clean, the contacts are free of corrosion.

 

Might check the lift mechanism then. See if the window is jamming up in it's tracks.